In a large fry pan, cook the jackfruit on medium-high heat in a good splash of oil for about 4 minutes, until they start to brown. Then add the thinly sliced onion. Using tongs (metal ideally), start to break up the jackfruit, continue to cook for another 5 minutes or so until the onions start to caramelise. Stir regularly and continue to break up the jackfruit. Add the water and 3/4 of the BBQ sauce and reduce the heat to a simmer.
If the pan you’re using doesn’t have a lid transfer to a medium pot, cover and cook for 20 minutes, stirring regularly and adding more water or BBQ sauce as needed. Cook until the jackfruit is soft and the sauce is thick and rich.